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September Weather in Unity, United States

Last updated: June 24, 2025

In Unity, United States, the average temperature in September hovers around 17°C (63°F). However, temperatures can vary significantly, with minimums dipping to -1°C (30°F) and maximums soaring to 32°C (90°F). Expect an average precipitation of 70 mm (2.8 in) over the course of 7 days, alongside a comfortable average humidity of 71%.

September Temperature in Unity

In September in Unity, the average temperature is 17°C (63°F). Maximums can reach 32°C (90°F) and minimums can drop to as low as -1°C (30°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both warm days and cool nights.

September Weather in Unity: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Unity, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Unity, September typically has an average temperature of 17°C (63°F), with highs reaching up to 32°C (90°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec232632445666727063513728
Data source: Temperature data for Unity generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Unity

In Unity in September, the precipitation amount is 70 mm (2.8 in) over a span of 7 days.

September Precipitation Trends in Unity

The chart displays monthly precipitation patterns in Unity, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Unity, September typically receives around 70 mm (2.8 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec70837212079801118470133101107
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Unity

In Unity in September, humidity is 71%. With an average temperature of 17°C (63°F), this humidity feels like a warm embrace, making outdoor activities enjoyable yet a bit sticky, so travelers should stay hydrated and take breaks in the shade.

September Average Humidity in Unity

This chart illustrates the average monthly humidity levels in Unity, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Unity is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%82%80%72%72%67%66%71%79%84%81%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Unity

In Unity in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Unity.

Maximum UV Index Levels in Unity for September

The chart shows the monthly maximum UV Index (UVI) for Unity in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Unity typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3468910997632
Data source: Unity September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Unity Compares to Other Months

Weather in Unity varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Unity, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Unity, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (24°F)70 mm (2.8 inches)86%moderate
February Weather-3°C (26°F)83 mm (3.3 inches)84%moderate
March Weather0°C (33°F)72 mm (2.8 inches)82%high
April Weather7°C (45°F)120 mm (4.7 inches)80%very high
May Weather14°C (57°F)79 mm (3.1 inches)72%very high
June Weather19°C (67°F)80 mm (3.1 inches)72%very high
July Weather22°C (72°F)111 mm (4.4 inches)67%very high
August Weather21°C (70°F)84 mm (3.3 inches)66%very high
September Weather17°C (63°F)70 mm (2.8 inches)71%high
October Weather11°C (51°F)133 mm (5.2 inches)78%high
November Weather3°C (37°F)100 mm (4.0 inches)84%moderate
December Weather-2°C (28°F)107 mm (4.2 inches)81%low

Compare Unity's Climate with Cities Worldwide